Keyhole-guard.



PATENTBD MAR. 22,1904. n.1).noRNBY. KEYHOLB- GUARD.,

AI 1I.|I(JATI0N FILED MAR. 27. 1903.

'No. 755,115.v

io MODEL.

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UNITED STATES atented March 22, IQ4.

PATENT OEEICE.

DANIEL DORNEY, OF ALLENTOWN, PENNSYLVANIA.

KEYHOLE-GUARD.

SPECIFICATION forming part of Letters Patent N0. 755,115, dated March 22, 1904.

Application filed March 27, 1903.

To all whom; it wwf/y concern:4

Be it known that I, DANIEL D. DORNEY, a citizen of the United States, residing at Allentown, in the county of Lehigh and State of Pennsylvania, have` invented a new and useful Keyhole-Guard, of which the following is a specification.

This invention relates to keyhole-guards for covering or obstructing the entrance to the keyholes of locks or the removal of the key therefrom; and the object of the invention is to provide a simply-constructed and easily applied and operated device whereby thev key will be irremovable until released from the interior of the room or the insertion of another key or pick from the outside, when no key is in the lock, prevented; and the invention consists in certain novel'features of the construction, as hereinafter shown and described, and specified Ain the claim.

In the drawings illustrative of the invention, in which corresponding parts are denoted by like designating characters, Figure 1 is a sectional side elevation of a lock with the improvement applied. Fig. 2 is a longitudinal sectional view on the line 2 2 of Fig. 1. Fig. 3 is a Y view similar to Fig. 2, illustrating the manner use with slight and unimportant modifications and for the purpose of illustration is shown applied to such a lock, IO representing the casing, 11 the latch-bolt, with its operating knob-tumbler 12, and 13 the lock-bolt, the

Ykeyholes being indicated at 14 15, respectively.

Slidably disposed in the casing 10 is a block 16, having a shoulder 17 and adapted to be projected past the keyholes and form a closure thereto. When only partially projected, the recess formed by the shoulder 17 will be opposite the upper part of the keyhole, leaving room for the shank or stock 18 of the key, so that when the key is inserted and partially turned and the block projected partially of the length of its range of motion the key will be locked and its removal or operative action relative to the bolt 13 prevented. By this Serial No. 149,875. (No model.)

simple means if the key be left in the lock it may be iirmly locked therein and its removal or manipulation from the outside eectually prevented. When the key is removed from the lock, the completion of the Amovement of the block 16 will entirely close the keyholes and eii'ectually prevent the insertion of another key or any picking instruments, as will be obvious.

Opposite the path of the block 16 one of the walls of the lock-casing will be provided with a slot 19, and a pin 20 will extend from the block through this slot to provide means for operating the block.

When the device is applied to mortise-locks, the slot 19 will be formed through the wall of the casing toward the inside of the room, and a 'corresponding aperture will be formed through the door and the pin 20 extended through both slots, so that it is operative from within the room, the slot in the door being guarded and finished by an ornamental escutcheon, so that the presence of the slot will not detract from the appearance of the door.

When employed in a rim-lock, the slot may be formed in the bottom wall of the casing, where its presence will not be noticeable.

The rear end of the block 16 is provided with a recess forming a shoulder 21, and operating against this shoulder is a spring-controlled stop 22, having an operating-pin 23 extending through an aperture in the casing and likewise through a corresponding aperture through the door when employed upon mortise-locks, as will be obvious. This recess formsV graduated stop-engaging surfaces for the stop 22.

The.` relative lengths' of the block 16 and 'stop 22 will be such that when the block is in its intermediate position, with the shoulder 17 in engagement with the shank-18 ofthe key, the stop 22 will rest against the shoulder 21, and when the block is in its full-projected position the stop will engage the rear end of the block. By this means it will be obvious that the block may be maintained either in its intermediate or closed position, and by forcing the spring-stop inward by its pin 23 the stop ywill be entirely released from the block and IOO the latter left free to be Withdrawn from action. The position of the block may therefore be easily controlled and maintained in any desired position.

The Whole device `is very simple, easily applied and operated, and will eectually 'protect the lock from surreptitious manipulation from the outside.

Having thus described the invention, what I claim is- The combination With a lock-easing having keyholes, of a block slidahly disposed in said casing and adapted to be moved to cover and form a closure for the keyholes, said block having a recess in its rear end forming grad- 

